It can be anything! An apex, subdomain, or even a URL.

Results forspf0.marketdojo.com

Resolver

Location

TXT

Name	TTL	Value
spf0.marketdojo.com	86400	v=spf1 ip4:96.45.68.130 ip4:136.143.188.0/24 ip4:136.143.184.0/24 ip4:135.84.80.0/24 ip4:135.84.82.0/24 ip4:8.39.54.0/23 ip4:204.141.32.0/23 ip4:136.143.182.0/23 ip4:204.141.42.0/23 ip4:8.40.222.0/23 ip4:65.154.166.0/24 include:spf1.marketdojo.com ~all